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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '649d6977adfe375b03669299b162a97cc627f05a038ef64ac988ae6732f53dff' 
  AND token = 'fI4w8Eie3BCB3Lb/OHduwIuCWCTm4fP7N4jFecY+fY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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