SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa7e89b31a42141503500b6725f297d2f4819fc977d5bf54fc2ade35bb636611' 
  AND token = '8Wp5+Pmi+oqChoDNz+h8fFXj/jAkt9T3ejV4ylsB0Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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