SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba02fa9a2288e478bef9994891c121d2b3a38ce16dd2bdc4cd3d4fc3e930d410' 
  AND token = 'wBlCKCxwr/9aUyH/aCJ7M3n2sl5XxYKX/wG9+vAGZVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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