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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d9ecbb6a9a909587f256ccb828727aeef9e05c467142f5f359996230821c3e8' 
  AND token = 'RNA4OnDwkLEE/Mw8LiLpVFC4WQxqx2UJDIujGTiS5Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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