Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68c3e6b2d9bf3b319e36910ad2d546f30553a27991b8159513b7f9bc8a9285bb' 
  AND token = 'VajhF6FlRu/41kE/O7UBMAZP4bHgA2pkNV21bkyEknw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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