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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e65f15179a88ce1533fc809c147815efaba596c4ab041dbc8c1c923f585d0c83' 
  AND token = 'UQlFFLKOrPBL7qoE+bN8pvWQq0M07m801lSm5Tgfuz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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