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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4f2cddb215bb650359a8e28cd8206374722afa93f453787f7bc07ac8cc04659' 
  AND token = 'VssFgMly0tjX2to+9QaBtdc3KpkXDlRtnfADQdXl3wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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