SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4c9132073d5e68870d14d2be17c76341bb40f58583dfc589670639f8ffcaf72' 
  AND token = 'yEpDxa0aGAwzi2TDo8cRcJUfKQyNgvC4+lDDS7ZBu90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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