SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d54d4b9717ae725ab89917c9c723eb77fff2921cd0df3cbcfa071643765d68a' 
  AND token = 't9cLKS/wG+oQKhQHv1jgH+6P0I4rJuOlzkFFdl2gLbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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