Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '150e0a9d68ab1a51d6c072bbdcb7f16fc8dc0b378eea85b3904af61ed2ee2d63' 
  AND token = 'UG5+y41jb0BqkohT0f+rMWDD7XH5ktpLFa7zroQibNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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