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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23d242df762b7c61d7e6047a8ba5b958273fea65cfa7670e15ebe77f8fd94ab0' 
  AND token = 'OjEIN8L+qxj7PIpj+DLkhTm/MhWIhlAeFHGLN0NnBy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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