SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54760c6eea5fbad9733c17ad86aeb43da0c69f3d623b8d40519b0027486ff48a' 
  AND token = 'jhPj3ZcmXst1LiRwkyInPuoIGU05UnO/Bvkg48jCiRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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