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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c07303bc6cc5739af73c7cee837e9f34297cd4ca02d69ff79f90427fa01cc7bf' 
  AND token = 'oy5C4eTTr/jWiQRqbnSvXcXr/iRu5sFay749c8wTbHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}