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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d7ae886b9eeaaf719f19c92ffcf694e82f3678e14337818fa8da790fc4db702' 
  AND token = 'yHM2ZoaJCY+47N1BReNNXpjgjos3RyQFh2FKgZRD4zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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