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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4093a4a94b468794a01cfa33aa97facbcd37eb699edc1bf8b944456700a2fe81' 
  AND token = 'X8k5f2OAbmg2Nc8gcQQvFb8MNBhxcE5CZr6/xHr92O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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