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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed191f29c180909152180f33d678adf748699fb85d80d42c300683c8c20d1795' 
  AND token = 'dBrhTsFduElfNK62yS4ETqtHuYyD+Z0lNnb0bz8TJWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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