SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f1bbd46600bebf2257bfda8c1700c9eaa05f2bc2aace41d978fd103c934105' 
  AND token = 'L5oZ4wPkkpo9tOMqWHRThvOWV+o5Yf9XzK/3nx1/6Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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