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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57b3b9faa4fdc37c093a23438239c094cc6f80e11336bd0bc912ebc687713671' 
  AND token = 'ENF7eAgn9zzhfGkj947iEEf0oJuOuOuGau+2Qe8+dYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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