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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fb577f4c610d9d1f5456863f8b4aeffc431c487ec34a09ce2a1dccf0ee67304' 
  AND token = 'XEp9g9777HNmjxKL/a9lAa/vJQiXW0KGDQ3UgF05R0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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