SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15fb7960741a0ff261dcd2682dfdef99931aa77020e1322a5643df871b5c6e2e' 
  AND token = 'YXK/nqPu91WjUJGSnEZKdTcOlpbbzohX7Dzk6SKnia8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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