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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b03150984f31ba0ab4479db92e17008f3967a4fea8ddd249d0cb08f498cab68d' 
  AND token = 'fljtpd95ev9Cf0MZAS2HTeBifdUJgmYV7K7BnKnpZGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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