SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b390016a4f81e02979c44135e22f08b2ae68f9789673baab11e111524c2b187' 
  AND token = 'oze16GHoN9OVcxYuv/TxwTc5U3GAYUVYY6J6RjGHhXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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