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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9af194b0ba3902eb372fe8f4f26b55b7e2e1311edb79146a6dfa032210dc44ba' 
  AND token = 'bp1vrlzBOm9uwzxUaZHo8hdScFmqmgdDoKWE5Wm5yR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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