SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0584b6f70f26f16866f2713c4cebd9033ec6e177e47b5d340cff59822bc38c40' 
  AND token = 'E1UFqJ8vyZU/OTwjslEKKWMellgRNmKdyO0CVVJy0qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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