SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75f04975d950f6edb3afcd282bc57c94be209d699d5273588d62e98a8f98d28c' 
  AND token = '+w2zBvcY0v9/09HSAYu4GlgiIX+jUH38hK5P+GFZD6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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