SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cbd984a477e3b7baeaf68b15d8e11171ee508d2c436798fe0c26b051ed89665' 
  AND token = 'ywAM8LILaaG7rzsGA19YlnTq6jXxZfpl/kpv+LtLFhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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