SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a22281a2be2902d5b2532a81f5fc469396079b0bc1eb20e68e70e104f7754535' 
  AND token = 'ITfixNw5tRbZpFHyNMnPCn8l0J124jdqkIYYKO7K+hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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