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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7827ffd475ec6a7e1b8e4dad2e492fea967490a73553f33c67b6d04f9aef05a5' 
  AND token = 'dQM6LNkEbtHZcD7I7DR0T5utp5mGLB4siAuDpPxcsFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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