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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5816c059b31bfa1907be2e2a2b186f58b4684f209dcb66fcc3ef38b105ac053e' 
  AND token = 'O78sPjQAMbsv3kdvnvjxlM2uC4C2b9ePUm9poT7yCf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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