SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff07594bb0e40b88a71664c463bc2baae4d0602f0dc416af35078e327592f09d' 
  AND token = 'jXkT3z8c1oOm8ig3zyvrBxVDTJoQKUhRgiaJfqzVo0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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