SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18524757844e86e3008e7c30b4835043a6fad552c0fc56bcfc9979bfc215ee53' 
  AND token = 'mKANqxLp2N/kGtoHomO+c+X+aJRwirl0MhSj0VSIUKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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