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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '460a5d35ea1a2d40fe5b4a1e144b0b9c5e70f17b80ad26d55a9c090e4f97b49c' 
  AND token = 'wce8kIRyBCBi2BQvjxcS5DlM4lp4Q1HiXpvJQdWuM68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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