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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '320bcbd143467f22aded917a5698a8962deaae0e7644ba448e6a7b5f34e7c029' 
  AND token = 'D4faCNbSFzcurC3xTU4FmANBfuVj1x9g8R3W+Hp9avs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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