SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd233c679466b4e5be9efabdff17d95512388c6b37e11594b84ecdcf27c07bd4b' 
  AND token = 'IGDKROa03cmAVu6ayTNggTKQwupLzOhUzIUrJm62raM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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