SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f349ac6b64f942d2a5663587b4a01a330bbce229855d4d920f26ce31cf190510' 
  AND token = 'mwBQ8TZZYWyLrIoFrOyGvGvgaby4+lelHiUsjqAHY68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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