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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32ad94a59749eb5e63c0e5b931eb244bb2d99ba014581136b29f6e7b24821ec2' 
  AND token = 'SBO/7utzWnF2M02nC87Y8XHMWCumzWCbdCaeS+rUksQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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