SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84db2789ad2b9900b297c3eb1d0c1256b6d18bc6f2e7f6ed0c2fde69b4e55f46' 
  AND token = 'ZjSaHAvSTtB3vpxFh0GLY5hZpAPj4VO9F9dRsl1YedU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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