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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ca918531899802be7606a27534af5c5c8dff720c7381424ba7569bfd80e1700' 
  AND token = 'XwjhEF5gwLYQkg6xF7EBVCdNik4Atg0Tm6MTBOH0Wek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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