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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de474a2f79c4d609bc6ebc81b73c57bc254dbc0c35fec1faa03d36aa9ae00aed' 
  AND token = 'G7FxQNbxuAkF3JugYpbVJvc/dnklQYKRYLcSVj6MdMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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