SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd183b54d5e1858a5b5ff0076aeea28d39d2cdda028600f903861eaf65968d410' 
  AND token = '41KxnLGqQ+piv+8PlRSfCEKLvPOujSA7JpuA8kYKWXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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