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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5ded4e10d91527a68f03d711fb6b8b5ae1aecbd0c30083c82e7560d3f110e96' 
  AND token = 'FDA+o+78mANr4jryk6K742r4lUXHrxCIPnNKyvfxyBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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