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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '329dbec9e2f5768983562441b0dd34d744c822a9b0f01fbdb66acf1ff9355848' 
  AND token = 'WcpNT1G1PekeeDDKpMBS9UOPadYCrLXyTe3Hrhk4j10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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