SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '382a9c1ede0f34a65cf3748fa2ab85ae06018735c406cf26f42dd382ed77eca1' 
  AND token = 'z58sPJJdp4lwYbvFWyrj8mqoH7oNgGfCII+fw/WYvxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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