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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aca5a647b3851ba5d1f61fe6a37b9b6e5f48e6db4d5c1c952c7cfbbb7c1e1838' 
  AND token = 'pe+QxH6gVIaJ1aDtppbGNnO2rEzesvyqZn8cXJylkcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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