Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e79177a89e86f5c16fe5e6417f25358c955b08e4d35fd0552d5c988cb7b9ea0b' 
  AND token = 'SRLxhXumhWWE0YMC+y2kFTrfDY3+SKHythd5HLGZa8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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