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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b38890989779e33df5b3bd502b5a04a3ded8e9c89fb38a4b7e98239ec6610b86' 
  AND token = 'v8b0QyU6sNOogydZbeVNZQnedHRnMrn6FRPunCDmpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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