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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '664debca463081d66740c3a67de23eb84dbe1e4e80dcaec4a8d1cfd721f9c894' 
  AND token = 'UoYkJ+VWFAweDwbnp9tQl2Ui3I8+vjBIEYdyyCUQG9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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