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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5552ee642f8e4babab6a13b274758fcdcf8f42b21ae3bc08fbae8e28ea719938' 
  AND token = 'F5nZqs1IvwRVJ9SW0OARGIzCauUIzOamn92yHMJzdAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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