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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41b0737ad8bc9b7d00b828fa728e825e84e5a8fe4e36beb8d5b0319f56bf9eb6' 
  AND token = 'daH5zNAtOMpUot/nBo+hCLJo/gLJY15h/MiXbVsQk0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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