SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1e5bbd90e57593c754668a549cfea77ed57672e9918d57b4895201a3ef0fdc4' 
  AND token = 'Z/zwi4BU97RrciVpKL8phL8U6VjIjzINa9C+dnpV+w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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