SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0abc232a0339f16e6f76598b85037f010483d4f6339c002eda999068616928db' 
  AND token = 'x/GVdhUXFRNgyJD6cWo6zsZBoQ5bkFpA7ME2iLRLNSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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