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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e59e70aaa20c7b14979d1cb1b977274c1ddf58623f9c90daf4e8197201812ac' 
  AND token = 'mtiCjOjqpcIcBfxUdPTgHn7pSI6gxDJmynlQGRUhCSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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