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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1648ff5e782c51a14bd8156cbef6ad7738fb1dd2e735fb42d91ad89b0ddae0e2' 
  AND token = '//infFovXqAFcAwn7IwYASs345a+A6GaEZg3ttiY0Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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