SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0115f0e630417b534123001b0ce9416aaaa0738ff77552b49229f96b6714209e' 
  AND token = 'MIl4AzAfaOP3vVAVKx1+p8u+/vGiYYj3g/9hLxib9nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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