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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '394b8bd177cbd91b68f53d35f8523194dc52060904e1c9e194b5706f35b9dbf9' 
  AND token = 'n4qzu72cVemnw79OO2aVNsOGZ8A85MUkaV1jmz5oZXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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