SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf1a6fc036a5cb782d94f235a36cff61e33c3654a37188ed1720d6d2876b30f9' 
  AND token = 'I789fBmLwdvugoA8CoiyDiZBuc08PqxzAVDOjlvri/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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