SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00e82b549c404a2af7480d74e316b5e69bf894fe07b38c4b777597ceff3b8692' 
  AND token = 'JYkomhX5lnQSSwcEcN+O3i/03yFFdZwR7u6XZWwgqbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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