SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7570b0369ca5af2dcb5cd477773c44921b4632d5c62bc899ab156b95fad34fdd' 
  AND token = 'Wwt9dipRUsR/iZlnxuEzYZadrc/WMzvx4JjCXtvKHlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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