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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7c014e19a146b21af7d290e2528e2c8f879a6bf421fe7cd30d8dfd2ac13adcb' 
  AND token = 'jTV94ndvjwMf9yqYb2ZYKtg9bYSyaqil7cB0VhtQjJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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