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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e06c1b2480e45c079479644c40a92333356fee119ec3e3a115320af55694a697' 
  AND token = 'mT6Z3Wyj7Kdai8HmOFf0J8O/7WQQdVWYOuRX79lvPzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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