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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3995fd925f24ae40f1d968824bbdab7e9b113d384e935cb6488afabfcd697ede' 
  AND token = 'AxVE7H5JHQj6SIdDO0d7wJsTqLckCffsdUcQV4B0N3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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