SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0067db1e7c09039299392b0d38bf8012b2c113e5f156190acd2c5fa8d97b01f' 
  AND token = 'jxq6VN+TzUhKhSswYCgl42QdRDDITDZ/iel9rtEiupg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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