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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36e468d5c50ce1367648e96c8ac5813f3fc8d0d215a721145585d3dad558b24d' 
  AND token = 'ChL8u8SidDYKmG5O5G8EiQH4o4fL9u99834To3InBAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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