SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd782529e5513754ff8a1aa235336207a5314c6c7e7589ff14bd5d149ce195cf' 
  AND token = 'bJ70Lvf3HdiAoNwH0WbgqHsFCyeCMoerNuj/UVtqr+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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