SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd45b95550c478c520d319037cdb57a7ad9028269339d4233af2f89b112c46da5' 
  AND token = 'q7AiNZjpkVl+CRZEv5fO6kl5xQu88Tjp5fuDbqNhBaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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