Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a20d777ec799607856fb8b6707d6dc03b5b43bf624fe5edd745b1cf9a81b08e8' 
  AND token = 'BRvNw2t3xAsmIkI2S1U0E+8CJyT2YiuuSQmvpfORxJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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